The doctrine of mental reservation, or of mental equivocation, was a special branch of casuistry developed in the late Middle Ages and the Renaissance, and most often associated with the Jesuits. ==Secular use== Mental reservation is a form of deception which is not an outright lie. It was argued for in moral theology, and now in ethics, as a way ...
[n] - an unstated doubt that prevents you from accepting something wholeheartedly
reservation noun an unstated doubt that prevents you from accepting something wholeheartedly